I don't think it's the moon. It's the heat in my opinion. My area that I've had trail cameras in since March, has been vacated by the deer in just the last two weeks. Checked two of my cameras on Sunday and only had a picture of one deer at each location, and that was in a 2 week period. Normally I'd have several deer coming by each day. So at least in my area, it's not that they went nocturnal, they're just not there.